Edit initramfs.conf as su.
Rem out COMPRESS-lz4 line
Run update-initramfs -u - System will return with "COMPRESS parameter not set".
Now edit initramfs.conf again. Remove the # on COMPRESS=lz4, run again update-initramfs -u.
It will close without any error. Reboot.
I just did and no more failed message.
Edit initramfs.conf as su.
Rem out COMPRESS-lz4 line
Run update-initramfs -u - System will return with "COMPRESS parameter not set".
Now edit initramfs.conf again. Remove the # on COMPRESS=lz4, run again update-initramfs -u.
It will close without any error. Reboot.
I just did and no more failed message.